ive always been told if i wanted to go for 500 or above i need stell crank and rods

so what will a yb crank and rods handle i.e

lightened and balanced
knife edged
tungstun coated

also rods polished and stressed relievd

balanced etc

will they be up to the job for 450 reliable

im using cosworth forged grp a pistons 7.2.1 c/r